CN211639535U - Large-bore pipe shot blasting machine - Google Patents

Abstract

The utility model discloses a large-bore pipe shot blasting machine, which comprises a frame, a steel pipe supporting mechanism arranged on the frame, an outer shot blasting component used for performing shot blasting treatment on the outer side of a steel pipe, and an inner shot blasting component used for performing shot blasting treatment on the inner side of the steel pipe, the steel pipe supporting mechanism comprises a main rolling element and a plurality of auxiliary rolling elements which are arranged on the upper surface of the machine frame, the main rolling element and the auxiliary rolling elements are arranged at intervals in the circumferential direction around a rotation central point, the rotation axes of the main rolling element and the auxiliary rolling elements are intersected at the rotation central point, a shot blasting support positioned beside the steel pipe supporting mechanism is vertically arranged on the machine frame, the upper end of the shot blasting support is hung with the outer shot blasting component and the inner shot blasting component, the outer shot-throwing component and the inner shot-blasting component are connected through a lifting linkage mechanism, so that the outer shot-throwing component and the inner shot-blasting component form ascending and descending direction linkage. The utility model discloses both can improve production efficiency, but also reduction in production cost.

Description

Large-bore pipe shot blasting machine

Technical Field

The utility model relates to a tubular product processing technology field, concretely relates to big bore pipe shot-blasting machine.

Background

In the prior art, people usually perform sand blasting and rust removing treatment on the surface of a steel pipe by using a shot blasting machine, the shot blasting machine uses compressed air as power to drive sand grains to be sprayed out from a shot blasting assembly at a high speed, the high-speed sand grains intensively impact the surface of the steel pipe, so that rust on the surface of the steel pipe is separated from the steel pipe, and then the sprayed sand grains, the removed rust and dust in the air are absorbed by a dust collection device, wherein the sand grains can be recycled and then reused. The method for removing the rust on the surface of the steel pipe by using the shot blasting machine has the advantages of high efficiency, thorough rust removal and the like.

When the surface of a large-aperture steel pipe needs to be subjected to shot blasting and rust removal, the steel pipe is usually transversely placed on a rack, rollers are arranged on two sides of the rack, and when the steel pipe is placed between the rollers on the two sides, the steel pipe can be kept stable on one hand, and the steel pipe can be conveniently rotated on the other hand, so that sufficient sand blasting treatment can be performed on all parts of the surface of the steel pipe. However, the existing shot blasting machine has the following defects when carrying out sand blasting and shot blasting treatment on a large-caliber steel pipe: it is known that when the shot blasting treatment is performed on the inner side wall of the steel pipe, shot blasting components of a shot blasting machine are required to enter the steel pipe, and the shot blasting components can become an independent component due to the obstruction of the side wall of the steel pipe, so that stable positioning and working inside the steel pipe are difficult. The above problem is more pronounced when the length of the steel pipe is longer. Therefore, people usually adopt the following two modes to solve the problem, one mode is to perform shot blasting directly in a manual mode, namely, an operator enters the steel pipe to perform manual shot blasting treatment on the inner side wall of the steel pipe, and the problems of low efficiency, high working strength, poor working environment and the like exist; the other type is that a support bracket is arranged in the steel pipe so that the shot blasting assembly can be conveniently moved into the steel pipe to perform shot blasting treatment, but the support bracket is time-consuming and labor-consuming to build, and the production cost is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problems of low efficiency and high cost of the existing shot blasting machine when the shot blasting treatment is carried out on the large-caliber steel pipe, providing a large-caliber pipe shot blasting machine, which can improve the production efficiency and reduce the production cost.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a large-bore pipe shot blasting machine comprises a frame, a steel pipe supporting mechanism arranged on the frame, an outer shot blasting component used for performing shot blasting treatment on the outer side of a steel pipe, and an inner shot blasting component used for performing shot blasting treatment on the inner side of the steel pipe, the steel pipe supporting mechanism comprises a main rolling element and a plurality of auxiliary rolling elements which are arranged on the upper surface of the machine frame, the main rolling element and the auxiliary rolling elements are arranged at intervals in the circumferential direction around a rotation central point, the rotation axes of the main rolling element and the auxiliary rolling elements are intersected at the rotation central point, a shot blasting support positioned beside the steel pipe supporting mechanism is vertically arranged on the machine frame, the upper end of the shot blasting support is hung with the outer shot blasting component and the inner shot blasting component, the outer shot-throwing component and the inner shot-blasting component are connected through a lifting linkage mechanism, so that the outer shot-throwing component and the inner shot-blasting component form ascending and descending direction linkage.

Similarly with prior art, the utility model discloses a be used for throwing the ball subassembly outward, be used for throwing the ball subassembly in the interior that the ball was handled to the steel pipe inboard to the steel pipe outside is thrown to the inside and outside lateral wall of alright while to throw the ball rust cleaning and handle. The utility model discloses set up the steel pipe supporting mechanism who is used for supporting the steel pipe in the frame, this steel pipe supporting mechanism is including setting up main rolling element and a plurality of follow rolling element at the frame upper surface, main rolling element with from rolling element at upwards interval arrangement of circumference to main rolling element intersects in a bit with the axis of rotation from rolling element. Therefore, different from the prior art, when the steel pipe needs to be subjected to shot blasting and rust removal, the steel pipe can be vertically placed on the rack, and the edge of the lower end of the steel pipe is supported on the main rolling element and the auxiliary rolling element, so that the steel pipe can rotate around a vertical axis. It can be understood that the steel pipe can be driven to rotate through the rotation of the main rolling element, and the auxiliary rolling element can enable the steel pipe to form rolling friction on the premise of stably supporting the steel pipe, so that the rotating friction force of the steel pipe is reduced, the steel pipe can be conveniently rotated, and the shot blasting treatment can be formed on the side wall of the steel pipe by the outer shot blasting assembly and the inner shot blasting assembly in the circumferential direction.

Especially, the utility model discloses an throw outside and throw between ball subassembly and the interior ball subassembly and be connected through lift link gear to the ball subassembly is thrown outward to the messenger and interior ball subassembly is thrown to the ball subassembly and is formed the direction linkage that rises and descend. That is, when the outer shot-blasting assembly descends to the lowest position, the inner shot-blasting assembly ascends to the highest position in a direction. At the moment, the steel pipe can be conveniently and vertically placed and supported on the steel pipe supporting mechanism on the rack. When the inner shot blasting assembly and the outer shot blasting assembly are started, so that shot blasting and rust removing treatment is started on the upper portion of the inner side wall of the steel pipe and the lower portion of the outer side wall of the steel pipe, on one hand, the steel pipe can be driven to rotate through the main rolling element, and therefore circumferential shot blasting is formed on the inner side wall and the outer side wall of the steel pipe; on the other hand, the lifting linkage mechanism can be opened, so that the outer shot blasting component gradually rises, and the inner shot blasting component synchronously and gradually falls. When the outer shot blasting component rises to the highest position, the inner shot blasting component falls to the lowest position, and therefore shot blasting and rust removing of the whole inner side wall and the whole outer side wall of the steel pipe are completed.

Because the inner shot blasting component and the outer shot blasting component are hung on the shot blasting bracket during the process of blasting, the inner shot blasting component can conveniently lift and descend in the steel pipe by means of the self gravity of the inner shot blasting component. Especially, when the length of steel pipe is longer, can solve the support problem when interior shot-blasting subassembly removes in the steel pipe effectively, be favorable to keeping suitable distance between interior shot-blasting subassembly and the steel pipe inside wall.

Preferably, the steel pipe supporting mechanism comprises two main rolling elements, the main rolling elements comprise a driving motor and a driving roller connected with the driving motor, a rolling ring groove is formed in the circumferential surface of the driving roller, the auxiliary rolling elements are cylindrical rollers rotatably arranged on the rack, and the two main rolling elements are arranged adjacently.

When the steel pipe is vertically placed on the steel pipe supporting mechanism, the lower end edge of the steel pipe is clamped in the rolling ring groove of the driving roller, so that the steel pipe can be well positioned, and the steel pipe is prevented from shifting when rotating. When the driving motor drives the driving roller to rotate, the steel pipe can be driven to rotate by means of the friction force between the steel pipe and the driving roller. And the lower edge of the steel pipe forms rolling friction with the roller. In particular, since the rolling elements are cylindrical rollers, when the diameter of the steel pipe is changed, the steel pipe can still be supported on the rollers, so that the steel pipe supporting mechanism can adapt to steel pipes with different sizes and specifications. It can be understood that the wall thickness is basically constant for steel pipes with different sizes and specifications, so that the positions of the inner shot-blasting assemblies and the outer shot-blasting assemblies in the horizontal direction can be kept constant, thereby greatly simplifying the structure of the shot blasting machine.

Preferably, the upper end of the shot blasting support is provided with a lifting motor and a fixed pulley connected with the lifting motor, a steel wire rope is wound on the fixed pulley, the outer end of the steel wire rope is connected with the outer shot blasting component, the inner end of the steel wire rope is connected with the inner shot blasting component, and the steel wire rope is wound on the positioning wheel for at least more than one circle.

When the lifting motor drives the fixed pulley to rotate, the inner and outer pill throwing assemblies can be synchronously driven to lift. The length of the steel wire rope can be reasonably set, so that the maximum lifting stroke of the inner shot blasting component and the maximum lifting stroke of the outer shot blasting component are matched with the maximum length of the steel pipe to be shot-blasted, and the shot blasting requirements of the steel pipes with different lengths can be met.

In particular, in the prior art, the wire rope is usually wound around the upper half of the fixed sheave. And the utility model discloses a wire rope is at least around establishing more than the round on the locating wheel, on the one hand, can increase the frictional force between wire rope and the fixed pulley effectively, avoids producing between wire rope and the locating wheel and skids, and on the other hand can ensure the synchronous lift of inside and outside throwing the ball subassembly.

Preferably, the shot blasting support is provided with a sliding frame and a lifting block which can move up and down, the outer end of the steel wire rope is connected with the sliding frame, the outer shot blasting assembly is fixed on the lower portion of the lifting block, the upper portion of the lifting block is provided with an auxiliary motor, the auxiliary motor is connected with an upward vertical adjusting screw rod, and the upper end of the adjusting screw rod is in threaded connection with the sliding frame.

When the lifting motor drives the fixed pulley to rotate, the inner end of the steel wire rope drives the inner shot blasting assembly to lift, and the outer end of the steel wire rope drives the sliding frame to move up and down on the shot blasting support. In addition, the auxiliary motor arranged on the lifting block can drive the adjusting screw to rotate, and the adjusting screw is in threaded connection with the sliding frame and drives the lifting block to lift, so that the height of the outer shot blasting assembly is adjusted, the maximum lifting stroke and the fall of the inner shot blasting assembly and the outer shot blasting assembly are changed, and the height of the inner shot blasting assembly and the height of the outer shot blasting assembly are adapted to the height of the steel pipe.

Preferably, the steel pipe supporting mechanism comprises two adjacent secondary rolling elements, the primary rolling elements and the secondary rolling elements are uniformly distributed in the circumferential direction, the rack is provided with two adjusting chutes extending along the radial direction of a rotation central point, an adjusting motor and a steering wheel close to the inner end of the adjusting chutes, the adjusting chutes are movably provided with sliding seats, the upper parts of the sliding seats are provided with the secondary rolling elements, the adjusting motor is connected with a traction sheave, the traction sheave is connected and wound with two traction ropes in the same direction, the two traction ropes are respectively connected with the sliding seat in the adjusting chute on one corresponding side after winding around one steering wheel, and the adjusting chutes on the outer sides of the sliding seats are internally provided with tension springs connected with the sliding seats.

We can have the master and slave rolling elements on the circle on which the largest diameter of the steel pipe to be shot blasted is located. When the diameter of the steel pipe is reduced, the adjusting motor can drive the traction sheave to rotate in the forward direction, and the traction rope pulls the sliding seat to overcome the elastic force of the tension spring to move radially inwards in the adjusting sliding groove so as to support the lower edge of the steel pipe with the smaller diameter. When the diameter of the steel pipe is increased, the traction sheave is driven to rotate reversely by the adjusting motor to release the traction rope, and the tension spring can pull the sliding seat to move outwards in the radial direction, so that the steel pipe supporting mechanism is suitable for steel pipes with different diameters. It can be understood that when the steel pipe rotates, the vertical pressure borne by the rolling unit has no axial force, so that the stable and reliable positioning of the rolling elements can be ensured.

Therefore, the utility model discloses following beneficial effect has: not only can improve the production efficiency, but also can reduce the production cost.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the steel pipe support mechanism.

Fig. 3 is a schematic view of a structure of the slave rolling element.

Fig. 4 is a partial structural view of the upper part of the shot blasting bracket.

Fig. 5 is a partial structure view of the lower part of the shot blasting bracket.

In the figure: 1. the device comprises a frame 11, an adjusting sliding sheave 2, an outer shot blasting assembly 3, an inner shot blasting assembly 4, a main rolling element 41, a driving motor 42, a driving roller 421, a rolling ring groove 5, a secondary rolling element 51, a sliding seat 6, a shot blasting bracket 61, a sliding frame 62, a lifting block 63, an auxiliary electrode 64, an adjusting screw 7, an adjusting motor 71, a steering wheel 72, a dragging wheel 73, a dragging rope 74, a tension spring 8, a lifting motor 81, a fixed pulley 82, a steel wire rope 9 and a steel pipe.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

As shown in fig. 1 and 2, the large-bore pipe shot blasting machine comprises a frame 1, a steel pipe supporting mechanism arranged on the frame, an outer shot blasting assembly 2 used for performing shot blasting treatment on the outer side of a steel pipe, and an inner shot blasting assembly 3 used for performing shot blasting treatment on the inner side of the steel pipe, wherein the steel pipe supporting mechanism comprises a main rolling element 4 and a plurality of auxiliary rolling elements 5 which are arranged on the upper surface of the frame, the main rolling element and the auxiliary rolling elements are arranged at intervals in the circumferential direction around a rotation central point, and the rotation axes of the main rolling element and the auxiliary rolling elements are horizontally arranged and intersect at the rotation central point. In addition, a shot blasting support 6 which is positioned beside the steel pipe supporting mechanism is vertically arranged on the rack, the upper end of the shot blasting support is hung with an outer shot blasting component and an inner shot blasting component, and the outer shot blasting component and the inner shot blasting component are connected through a lifting linkage mechanism, so that the outer shot blasting component and the inner shot blasting component form lifting and descending direction linkage. When the outer shot blasting component rises, the inner shot blasting component synchronously falls: when the outer shot blasting component descends, the inner shot blasting component ascends synchronously.

When the steel pipe needs to be subjected to shot blasting and rust removal, the outer shot blasting assembly can be lowered to the lowest position, the inner shot blasting assembly is raised to the highest position, then the steel pipe 9 can be vertically hung on the rack, the edge of the lower end of the steel pipe is supported on the main rolling element and the auxiliary rolling element, and the steel pipe can rotate around the vertical axis due to the fact that the rotating axes of the main rolling element and the auxiliary rolling element are horizontally arranged. At the moment, the outer shot blasting component starts to perform shot blasting treatment on the lower part of the outer side wall of the steel pipe, and the inner shot blasting component starts to perform shot blasting treatment on the upper part of the inner side wall of the steel pipe. It can be understood that the steel pipe can be driven to rotate through the rotation of the main rolling element, and then the shot blasting assembly can perform shot blasting and rust removing treatment on the side wall of the steel pipe in the circumferential direction through the outer shot blasting assembly and the inner shot blasting assembly. And then, starting the lifting linkage mechanism to enable the outer shot blasting component to gradually rise so as to gradually perform shot blasting treatment on the outer side wall upwards, and the inner shot blasting component synchronously and gradually descends so as to gradually perform shot blasting treatment on the inner side wall downwards. When the outer shot blasting component rises to the highest position, the inner shot blasting component falls to the lowest position, and therefore shot blasting and rust removing of the whole inner side wall and the whole outer side wall of the steel pipe are completed.

It should be noted that the lifting stroke of the inner and outer projectile throwing assemblies should be adapted to the length of the steel tube. As the shot blasting machine, a sand storage barrel, a dust suction device and other mechanisms need to be arranged, and as the shot blasting machine is in the prior art, the specific structures of the inner shot blasting component and the outer shot blasting component in the embodiment are not described in detail, and for example, refer to related patent document with publication number CN 108406610B.

As a preferable scheme, as shown in fig. 2, the steel pipe supporting mechanism comprises two main rolling elements, the two main rolling elements are adjacently arranged, the main rolling elements comprise a driving motor 41 and a driving roller 2 connected with the driving motor, a rolling ring groove 421 is arranged on the circumferential surface of the driving roller, and the driven rolling element is a cylindrical roller which is rotatably arranged on the frame.

When the steel pipe is vertically placed on the steel pipe supporting mechanism, the lower end edge of the steel pipe is clamped in the rolling ring grooves of the two driving rollers, so that the steel pipe can be well positioned, and the steel pipe is prevented from shifting when rotating. When the driving motor drives the driving roller to rotate, the steel pipe can be driven to rotate by means of the friction force between the steel pipe and the driving roller. And the lower edge of the steel pipe forms rolling friction with the roller. Because the cylindrical rollers are arranged in the radial direction, when the diameter of the steel pipe is changed, the position of the secondary rolling element does not need to be moved, and the lower end edge of the steel pipe can still be supported on the rollers, so that the steel pipe supporting mechanism can adapt to steel pipes with different sizes and specifications. It will be appreciated that we can ensure reliable support of the largest and smallest diameter steel tube on the drum by setting the length of the drum reasonably.

Further, the steel pipe supporting mechanism comprises two adjacent slave rolling elements, the master rolling elements and the slave rolling elements are uniformly distributed in the circumferential direction, and the master rolling elements and the slave rolling elements are positioned on a circle where the maximum diameter of the steel pipe to be shot-blasted is located. Specifically, the first and second are master rolling elements, and the third and fourth are slave rolling elements.

As shown in fig. 3, two adjusting chutes 11 extending radially along the rotation center point, an adjusting motor 7 located between the two adjusting chutes, and a steering wheel 71 located near the inner end of the adjusting chute are disposed on the frame, the axis of the steering wheel is vertically disposed, the adjusting chute is movably disposed with a sliding seat 51, and one of the secondary rolling elements is disposed on the upper portion of each sliding seat. In addition, the adjusting motor is connected with a traction sheave 72, two traction ropes 73 are connected on the traction sheave and wound around the traction sheave in the same direction, the two traction ropes are respectively connected with a sliding seat in the adjusting sliding groove on one corresponding side after passing around a steering wheel, a tension spring 74 is arranged in the adjusting sliding groove on the outer side of the sliding seat, one end of the tension spring is connected with the sliding seat, and the other end of the tension spring is connected with the machine frame.

When the diameter of the steel pipe needing shot blasting is small, the adjusting motor can drive the traction sheave to rotate in the forward direction, the traction rope at the moment is wound on the traction sheave, and the traction rope can pull the sliding seat to overcome the elasticity of the tension spring to move radially inwards in the adjusting sliding groove so as to support the lower edge of the steel pipe with the small diameter. When the diameter of the steel pipe is larger, the traction sheave is driven to rotate reversely by only adjusting the motor to release the traction rope, and at the moment, the tension spring can pull the sliding seat to move outwards in the radial direction, so that the steel pipe supporting mechanism is suitable for steel pipes with different diameters.

As another preferred scheme, a lifting motor 8 can be arranged at the upper end of the shot blasting support, a fixed pulley 81 is arranged on an output shaft of the lifting motor, a steel wire rope 82 is wound on the fixed pulley, the outer end of the steel wire rope is connected with the outer shot blasting component, and the inner end of the steel wire rope is connected with the inner shot blasting component, so that the inner shot blasting component and the outer shot blasting component can be driven to lift. When the lifting motor drives the fixed pulley to rotate, the inner and outer pill throwing assemblies can be synchronously driven to lift. By reasonably setting the length of the steel wire rope, the maximum lifting stroke of the inner shot blasting component and the maximum length of the steel pipe to be shot-blasted are matched, so that the shot blasting requirements of the steel pipes with different lengths are met.

Preferably, the steel wire rope can be wound on the positioning wheel for a half circle, so that on one hand, the friction force between the steel wire rope and the fixed pulley can be effectively increased, the steel wire rope and the positioning wheel are prevented from slipping, and on the other hand, the synchronous lifting of the inner shot throwing assembly and the outer shot throwing assembly can be ensured. In addition, a telescopic sleeve extending downwards can be arranged at the upper end of the shot blasting support, the cross section of the telescopic sleeve is rectangular, a steel wire rope penetrates through the telescopic sleeve, and the lower end of the telescopic sleeve is connected with the inner shot blasting support. When the fixed pulley rotates, thereby when throwing the ball subassembly through in the wire rope drive and go up and down, shot the subassembly and stretch out and draw back in the telescope tube follows to throw the ball subassembly and form good horizontal support to throwing the ball subassembly internally, avoid the wire rope and throw about the ball subassembly and rock even rotate.

It should be noted that the weights of the inner shot blasting assembly and the outer shot blasting assembly can be kept basically consistent, so that the moments on two sides of the fixed pulley are kept basically balanced, and the load and the power consumption of the lifting motor can be reduced remarkably.

Furthermore, a sliding frame 61 and a lifting block 62 which can move up and down along the shot blasting support can be arranged on the shot blasting support, and the outer end of the steel wire rope is connected with the sliding frame. The outer shot-throwing component is fixed on the lower part of the lifting block, the upper part of the lifting block is provided with an auxiliary motor 63, the output shaft of the auxiliary motor is connected with an upward vertical adjusting screw rod 64, and the upper end of the adjusting screw rod is in threaded connection with the sliding frame.

When the lifting motor drives the fixed pulley to rotate, the inner end of the steel wire rope drives the inner shot blasting assembly to lift, and the outer end of the steel wire rope drives the sliding frame to move up and down on the shot blasting support. In addition, the auxiliary motor arranged on the lifting block can drive the adjusting screw to rotate, and the adjusting screw is in threaded connection with the sliding frame and drives the lifting block to lift, so that the height of the outer shot blasting assembly is adjusted, the maximum lifting stroke and the fall of the inner shot blasting assembly and the outer shot blasting assembly are changed, and the height of the inner shot blasting assembly and the height of the outer shot blasting assembly are adapted to the height of the steel pipe.

It will be appreciated that the auxiliary electrode may be a dc motor and driven by a rechargeable lithium battery to simplify the arrangement of the circuit.

Claims (5)

1. A large-bore pipe shot blasting machine comprises a frame, a steel pipe supporting mechanism arranged on the frame, an outer shot blasting component used for performing shot blasting treatment on the outer side of a steel pipe, and an inner shot blasting component used for performing shot blasting treatment on the inner side of the steel pipe, the steel pipe support mechanism is characterized by comprising a main rolling element and a plurality of auxiliary rolling elements which are arranged on the upper surface of a machine frame, wherein the main rolling element and the auxiliary rolling elements are arranged at intervals in the circumferential direction around a rotation central point, the rotation axes of the main rolling element and the auxiliary rolling elements are intersected at the rotation central point, a shot blasting support positioned beside the steel pipe support mechanism is vertically arranged on the machine frame, an outer shot blasting assembly and an inner shot blasting assembly are hung at the upper end of the shot blasting support, the outer shot-throwing component and the inner shot-blasting component are connected through a lifting linkage mechanism, so that the outer shot-throwing component and the inner shot-blasting component form ascending and descending direction linkage.

2. The shot blasting machine for large-bore pipes according to claim 1, wherein the steel pipe supporting mechanism comprises two main rolling elements, the main rolling elements comprise a driving motor and a driving roller connected with the driving motor, a rolling ring groove is formed on the circumferential surface of the driving roller, the slave rolling element is a cylindrical roller rotatably arranged on the frame, and the two main rolling elements are arranged adjacently.

3. The large-bore pipe shot blasting machine as claimed in claim 1, wherein a lifting motor and a fixed pulley connected with the lifting motor are arranged at the upper end of the shot blasting bracket, a steel wire rope is wound on the fixed pulley, the outer end of the steel wire rope is connected with the outer shot blasting component, the inner end of the steel wire rope is connected with the inner shot blasting component, and the steel wire rope is wound on the positioning wheel for at least more than one turn.

4. The large-aperture pipe shot blasting machine as claimed in claim 3, wherein the shot blasting support is provided with a carriage and a lifting block which can move up and down, the outer end of the steel wire rope is connected with the carriage, the outer shot blasting assembly is fixed at the lower part of the lifting block, the upper part of the lifting block is provided with an auxiliary motor, the auxiliary motor is connected with an upward vertical adjusting screw, and the upper end of the adjusting screw is in threaded connection with the carriage.

5. The shot blasting machine with large-bore pipes of claim 2, wherein the steel pipe supporting mechanism comprises two adjacent secondary rolling elements, the primary rolling elements and the secondary rolling elements are uniformly distributed in the circumferential direction, the frame is provided with two adjusting chutes extending radially along the rotation center point, an adjusting motor, and a steering wheel near the inner end of the adjusting chutes, the adjusting chutes are movably provided with sliding seats, the upper parts of the sliding seats are provided with the secondary rolling elements, the adjusting motor is connected with a traction wheel, the traction wheel is connected with two traction ropes in a co-rotating manner, the two traction ropes are respectively connected with the sliding seat in the adjusting chute on one side after passing through one steering wheel, and the adjusting chute on the outer side of the sliding seat is provided with a tension spring connected with the sliding seat.

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